George l



(No Model.)

G. L. CAMPBELL. BORING 1111101111111.

No. 447,176. Patented 1911-24, 1891.

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UNITED STATES PATENT OEEICE.

GEORGE L. CAMPBELL, OF VILLIAMSPORT, PENNSYLVANIA, ASSIGNOR TO CHET S. HILL AND J. B. Il. TRAINER, BOTH OF SAME PLACE.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 447,176, dated February 24, 1891.

Application filed May 3, 1890. Serial No. 350,430. (No model.)

To all whom it may concern:

Be it known that I, GEORGE L. CAMPBELL, of Williamsport, in the county of Lycoming and State of Pennsylvania, have invented a new and Improved Boring-Machine, of which the following is a full, clear, yand exact description.

The object of the invention is to provide a new and improved boring-machine which is simple and durable in construction, very effective in operation, and specially designed for conveniently boring holes in joists of a ceiling or i'loor for the electric wires.

The invention consists in certain parts and details and combinations of the same, as will be described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation of the improvement. Fig. 2Y is a side elevation of the same, with part-s in section. Fig. 3 is a plan view of the same, with parts in sect-ion; and Fig. 4 is an enlarged transverse section of the drillshaft.

The improved boring-machine is mounted on a suitably-constructed frame A, provided on its lower end with a rod B, having a crook B', adapted to be set on the operators knee to support the frame A while boring.

In the lower part of the frame A is mounted to turn the main driving-shaft C, on one end of which is secured a crank-arm D for conveniently turning the said shaft C. On the latter is secured a sprocket-wheel E, over which passes an endless sprocket-chain F, also passing over a sprocket-wheel G, mounted to turn on a stud H, held in one side of the rectangular auxiliary frame A', secured on the upper end of the main frame A at right angles thereto.

On one face of the` sprocket-wheel G is formed a bevel gear-wheel I, which meshes into a bevel gear-wheel J, keyed upon a sleeve `K, mounted to turn in one side of the auxiliary frame A', as is plainly shown in Fig. 3.

Through this -sleeve K passes the drill-shaft passage of concealed allel with the plate Q.

L,- carrying at its front end the drill or boringtool N and provided at its other end with a screw-thread L', screwing in a nut A2, formed in the auxiliary frame A. On the drill-shaft L is also formed a'key or feather L2, fitting into a correspondiugly-shaped groove or slot K', formed in the sleeve K. (See Figs. 3 and 4.) lVhen the' main shaft C is rotated, a rotary motion is imparted to the sprocket-wheels E G, the sprocket-chain F, and the bevel gearwheels I and J to the sleeve K, which in turn rotates the drill-'shaft L. The rotary motion of the latter causes its threaded endL to screw in the nut A2, so that the drill-shaft is fed forward or backward, according to the direction in which the main shaft C is turned.-

On the main frame A isarranged an auxiliary frame P, which supports a bracket O, provided near its upper end with a verticallyextending plate Q, held in front of the boringtool N and extending at right angles to the same. An aperture Q is formed in the said plate Q, ad throughit can pass the boring-tool when the shaft L is fed forward, as previously desoribed,in order to drill orbore a hole in the joist on which the machine is to be applied.

On the bracket O is fulcrumed at R an L- shaped lever R, guided at one end in an aperture Q2, formed in the plate Q, the outer end of this arm of the leverR being provided lwith an upward extension R2, arranged par- The lower end of the lever R is provided with a handle R3 and is adapted to engage notches in a segmental arm S, secured on the bracket O. The extension R2 is provided with inwardly-projecting lugs or points R4, adapted tov engage the back of the beam or joist T, on the front of which abuts the plat-e Q, as plainly illustrated in Fig. 2.

-When the operator desires to bore an aperturethrough the joist or beam T for the passageof the electric wires or for other purposes, he lirst moves the main frame A into Such a position that the plate Q abuts against one side of the joist, and then the handle end R3 of the leverR is swung outward toward the joist, so as to move the upper'end of the said lever with the extension R2 inward against the ICO other side of the joist T, the lugs R1 embedding themselves in the joist. The underside of the j oist T is engaged by the horizontallyextending part of the lever R, so that the drill-shaft L now stands at right angles to the j oist T, and when the operator turns the crankarm D to rotate the shaft C the drill-shaftL is also rotatedand fed forward, as previously described, so that the boring-tool N passes through the opening Q' in the plate Q and bores a hole in the joist T. Then the hole has been bored, the operator reverses the movement of the crank-arm D, soas to turn the drilling-tool N out of the joist T. The next j oist is operated on in the same manner, and it will be seen that all apertures bored into the joists by the machine can be brought into the proper alignment, as the said apertures willbe at right angles to the sides of the beam. The auxiliary fra-me P is provided with side arms P', passing over the sides of the frame A, and `each arm is provided with a lug P2, -adapted to engage one of a series of apertures formed in thesides of the frame A, as shown in Figs. l and 2, so as to lock the frame P in placoon the main frame A. XVhen the operator desires to bore a hole above 'the one already bored, he moves the arms P' outward and presses on the fork l5', so as to slide the main frame A upward until the tool N is the proper distance above the hole already bored, the `auxiliary frame remaining stationary. \Vhen the frame A has been adj usted to the proper place, the operator lets go ot' the arms P', so that the lugs P2 snap into the registeringapertures in the sides of the frame A.

The operation above described in reference to setting' the tool N in motion is repeated and an aperture is bored above the first one.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A hand implement of the character described, comprising the open two-part rectangular frame A A', the boring-bit mounted in the part A' at right angles to the part A, an operating mechanisimand the auxiliary sliding frame P, sliding vertically on the side bars of the part A .and having an outwardly-projecting bracket R, provided with clamping- 5o plates in front of and at right angles to the said boring-bit, substantially as described.

2. A hand implement of the character described, comprising the open two-part rectangular frame A A', the part A being provided 55 end at right angles to the boring-bit, substantially as described.

3. A hand implement of the character described, comprising the two-part open frame AA', the bit mounted in the part A' andprovided with operating mechanism, the auxiliary frame P on the part A, provided with au outwardly and upwardly projecting lbracket having a plate Q at its outer end at right auglcs to the bit, a lever R,pivoted between its ends to the bracket, passed through a slot Q2 therein, and havinga plate R2 at its outer 'upper end and ahandle portion atits lower end, and means for lockingthe said lever, substantially as described.

4. An implement of the character described, consisting in the two-part open frame A A', the rod l at the lower end of part A-andhaving a crook B', the main drive-shaft C, having a wheel,the Wheel Ginpthe upper part A of the frame, provided with a gearl and driven from the wheel on shaft C, the nut A2 in one side ot the part A',the sleeve K, crossing the part A' in the line with the `nut and provided with a gear J, meshing with gear I, the threaded-bit shank L, passing through said sleeve and nut, a spline and groove connecting between said sleeve and shank, the sliding auxiliary frame P, having the bracket O, provided with plate Q, and clamping-lever R, having a plate R2, substantially as described.

GEORGE L. CAMPBELL.

Witnesses:

JUSTIN S. HILL, WM. K. ARMSTRONG. 

